Two crashes just moments apart near the mouth of Butterfield Canyon injured eight people early Sunday morning.
Two cars were driving at a high rate of speed side by side on 12600 South and U-111 at 3:20 a.m., said Salt Lake County Sheriff's deputy Peggy Faulkner. Investigators did not know Monday whether the cars were racing.
As the cars were rounding a turn, one car lost control, left the road and hit a building, Faulkner said. The three occupants of the car were flown by medical helicopter to LDS Hospital and University Hospital.
One of the passengers in the vehicle, 18, was in critical condition Monday. The others were listed in fair and serious condition.
The second car continued around the curve but in the wrong lane of traffic and hit an oncoming truck head-on, Faulkner said. Two people in the car and two in the truck were taken to area hospitals.
The driver of the second car left the scene but later turned himself in while seeking medical treatment at a fire station in West Jordan, Faulkner said.
Alcohol was involved in all three vehicles, she said.